ClickHouse/dbms/src/Interpreters/NullableUtils.cpp

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#include <Interpreters/NullableUtils.h>
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namespace DB
{
void extractNestedColumnsAndNullMap(ColumnRawPtrs & key_columns, ColumnPtr & null_map_holder, ConstNullMapPtr & null_map)
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{
if (key_columns.size() == 1)
{
auto & column = key_columns[0];
if (!column->isColumnNullable())
return;
const ColumnNullable & column_nullable = static_cast<const ColumnNullable &>(*column);
null_map = &column_nullable.getNullMapData();
column = &column_nullable.getNestedColumn();
}
else
{
for (auto & column : key_columns)
{
if (column->isColumnNullable())
{
const ColumnNullable & column_nullable = static_cast<const ColumnNullable &>(*column);
column = &column_nullable.getNestedColumn();
if (!null_map_holder)
{
null_map_holder = column_nullable.getNullMapColumnPtr();
}
else
{
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MutableColumnPtr mutable_null_map_holder = (*std::move(null_map_holder)).mutate();
PaddedPODArray<UInt8> & mutable_null_map = static_cast<ColumnUInt8 &>(*mutable_null_map_holder).getData();
const PaddedPODArray<UInt8> & other_null_map = column_nullable.getNullMapData();
for (size_t i = 0, size = mutable_null_map.size(); i < size; ++i)
mutable_null_map[i] |= other_null_map[i];
null_map_holder = std::move(mutable_null_map_holder);
}
}
}
null_map = null_map_holder ? &static_cast<const ColumnUInt8 &>(*null_map_holder).getData() : nullptr;
}
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}
}